The warning applies to both eastern and western Middlesex County, including London, Parkhill, Strathroy and Komoka.

The precipitation is expected to start as snow overnight, before changing briefly to ice pellets. Up to eight centimetres of accumulation is expected before the snow and ice pellets then change to freezing rain.

The freezing rain will continue for two to six hours before changing again, this time to rain, late Tuesday afternoon.

Strong winds are also part of the mix for Tuesday, with easterly gusts up to 70 km/h expected.

The messy mix will make highways, roads, walkways and parking lots slippery and icy.

Drivers are asked to prepare for changing road conditions. Also, ice build-up may cause tree branches to break and, thanks to the wind, power outages are possible.

Environment Canada meteorologist Gerald Chang said a Colorado low is to blame for all this. It will cross southern Ontario Tuesday and Wednesday.

"It's scooping up a lot of moisture from the Gulf of Mexico and some warmth as well and that's why we are going to see some freezing rain," he said.

Chang said freezing rain totals of between five to 10 millimetres are expected.

The City of London has put in place a ban on overnight parking to help keep roadways clear for plows.

To prepare for tonight's expected storm, the overnight parking ban is now in place. Please make sure your vehicles are off the streets tonight, so snow plows and salt trucks can move through easily. <a href="https://twitter.com/hashtag/LdnWinter?src=hash&amp;ref_src=twsrc%5Etfw">#LdnWinter</a> <a href="https://twitter.com/hashtag/LdnOnt?src=hash&amp;ref_src=twsrc%5Etfw">#LdnOnt</a> <a href="https://t.co/46CNyTbwoX">pic.twitter.com/46CNyTbwoX</a>

London's airport is reporting that some flights have already been affected by the weather advisory. Passengers are asked to check flights before heading to the airport.

We're anticipating freezing rain overnight into the morning in <a href="https://twitter.com/hashtag/LdnOnt?src=hash&amp;ref_src=twsrc%5Etfw">#LdnOnt</a>. Please stay safe out there! Flights have been affected by the weather advisory, so check your flight status and contact your airline before heading out to the airport tomorrow! <a href="https://t.co/4lAd7vBHSu">pic.twitter.com/4lAd7vBHSu</a>